Former JACKASS star Bam Margera has severed ties with pop beauty Jessica Simpson in a bid to end speculation about the pair's rumoured affair.

Margera's friendship with Simpson was strained in May (05) when his father told a radio station that his son and the married DUKES OF HAZZARD star had slept with each other.

And while Margera spoke out the following month to explain that they did fall asleep on the same couch but nothing sexual happened, he's now decided that there's only one way to combat the rumours and gossip.